Sticky elements are predominantly used for keeping something shown on the screen throughout scrolling. As cool as that is, we can also hide elements in the same way!
The purpose of a sticky footer is that it "sticks" to the bottom of the browser window. But not always, if there is enough content on the page to push the footer lower, it still does that. But if the content on the page is short, a sticky footer will still hang to the bottom of the browser window.
